Avid iPhone lover! Get 6 or wait for 6S?

Hey guys. Love this forum and love my Apple iPhone! I had a 4, 4S then stupidly went android for awhile (never again) then came back to the 5 and 5C.

My iPhone 5 I have now is pretty much burnt out. Freezes all the time, battery draining, slow... Etc. it's just almost 3 years old and wasn't taken care of properly by the previous owner.
SO I am wanting to get the iPhone 6. My question is... Is that a bad move? Should I wait until September for the 6S? I really don't want to because this current phone is pretty bad and I don't really have any options to use another phone in the interim. I suppose I could use my sister in laws LG G3 Vigor but that just sounds awful.

With having this phone for the next 2 years, I want to make sure I am making the right choice. I love everything I have seen and read about the 6, but just wanted to ask your alls advice.

I have a 5s in mint condition and I've decided to wait for the 6s/6sPlus. If your iPhone is in working condition I suggest waiting on the 6s

That's the thing... My current iPhone 5 is almost in non working condition. It freezes up probably... 4-5 times day to the point I must completely shut off the phone and restart. It also lags terribly. Like what I'm typing now is about 2-3 seconds behind real time.
Battery dies within about 2 hours with a full charge.

So it's technically "usable" but incredibly incredibly frustrating, unreliable and I'm not sure if it can last another 3+ months?

That's the thing... My current iPhone 5 is almost in non working condition. It freezes up probably... 4-5 times day to the point I must completely shut off the phone and restart. It also lags terribly. Like what I'm typing now is about 2-3 seconds behind real time.
Battery dies within about 2 hours with a full charge.

So it's technically "usable" but incredibly incredibly frustrating, unreliable and I'm not sure if it can last another 3+ months?

Grrr- decisions

In this case, I think I would go ahead and get the iPhone 6. 3/4 months can seem like a eternity when waiting even if your current device isn't acting up.

I would just get the 6 now if your phone is that bad. If history is a indicator the next iPhone will just be a minor upgrade instead of a overhaul like the iPhone's 4, 5, and 6 so you won't be missing much imo